well back in the day you had on resistance and that's how you bought a speed control. the tekin 300 had .0015 on resistance and the tekin 600 had .0009 and then the tekin 700 had .0005 and that's what I ran in 4wd dirt oval with 7 cells and a black magic 12 quad... so what's the on resistance of all the current blinky speedos should be your question.